/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
/* SHA-256 (FIPS 180-4) implementation in JavaScript                  (c) Chris Veness 2002-2016  */
/*                                                                                   MIT Licence  */
/* www.movable-type.co.uk/scripts/sha256.html                                                     */
/*                                                                                                */
/*  - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html                              */
/*        http://csrc.nist.gov/groups/ST/toolkit/examples.html                                    */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */

'use strict';


/**
 * SHA-256 hash function reference implementation.
 *
 * This is a direct implementation of FIPS 180-4, without any optimisations. It is intended to aid
 * understanding of the algorithm rather than for production use, though it could be used where
 * performance is not critical.
 *
 * @namespace
 */
let Sha256 = {};


/**
 * Generates SHA-256 hash of string.
 *
 * @param   {string} msg - (Unicode) string to be hashed.
 * @param   {Object} [options]
 * @param   {string} [options.msgFormat=string] - Message format: 'string' for JavaScript string
 *   (gets converted to UTF-8 for hashing); 'hex-bytes' for string of hex bytes ('616263' ≡ 'abc') .
 * @param   {string} [options.outFormat=hex] - Output format: 'hex' for string of contiguous
 *   hex bytes; 'hex-w' for grouping hex bytes into groups of (4 byte / 8 character) words.
 * @returns {string} Hash of msg as hex character string.
 */
Sha256.hash = function(msg, options) {
    let defaults = { msgFormat: 'string', outFormat: 'hex' };
    let opt = Object.assign(defaults, options);

    // note use throughout this routine of 'n >>> 0' to coerce Number 'n' to unsigned 32-bit integer

    switch (opt.msgFormat) {
        default: // default is to convert string to UTF-8, as SHA only deals with byte-streams
        case 'string':   msg = Sha256.utf8Encode(msg);       break;
        case 'hex-bytes':msg = Sha256.hexBytesToString(msg); break; // mostly for running tests
    }

    // constants [§4.2.2]
    let K = [
        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 ];

    // initial hash value [§5.3.3]
    let H = [
        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 ];

    // PREPROCESSING [§6.2.1]

    msg += String.fromCharCode(0x80);  // add trailing '1' bit (+ 0's padding) to string [§5.1.1]

    // convert string msg into 512-bit blocks (array of 16 32-bit integers) [§5.2.1]
    let l = msg.length/4 + 2; // length (in 32-bit integers) of msg + ‘1’ + appended length
    let N = Math.ceil(l/16);  // number of 16-integer (512-bit) blocks required to hold 'l' ints
    let M = new Array(N);     // message M is N×16 array of 32-bit integers

    for (let i=0; i<N; i++) {
        M[i] = new Array(16);
        for (let j=0; j<16; j++) { // encode 4 chars per integer (64 per block), big-endian encoding
            M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) |
                (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
        } // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
    }
    // add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
    // note: most significant word would be (len-1)*8 >>> 32, but since JS converts
    // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
    let lenHi = ((msg.length-1)*8) / Math.pow(2, 32);
    let lenLo = ((msg.length-1)*8) >>> 0;
    M[N-1][14] = Math.floor(lenHi);
    M[N-1][15] = lenLo;


    // HASH COMPUTATION [§6.2.2]

    for (let i=0; i<N; i++) {
        let W = new Array(64);

        // 1 - prepare message schedule 'W'
        for (let t=0;  t<16; t++) W[t] = M[i][t];
        for (let t=16; t<64; t++) {
            W[t] = (Sha256.σ1(W[t-2]) + W[t-7] + Sha256.σ0(W[t-15]) + W[t-16]) >>> 0;
        }

        // 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value
        let a = H[0], b = H[1], c = H[2], d = H[3], e = H[4], f = H[5], g = H[6], h = H[7];

        // 3 - main loop (note 'addition modulo 2^32')
        for (let t=0; t<64; t++) {
            let T1 = h + Sha256.Σ1(e) + Sha256.Ch(e, f, g) + K[t] + W[t];
            let T2 =     Sha256.Σ0(a) + Sha256.Maj(a, b, c);
            h = g;
            g = f;
            f = e;
            e = (d + T1) >>> 0;
            d = c;
            c = b;
            b = a;
            a = (T1 + T2) >>> 0;
        }

        // 4 - compute the new intermediate hash value (note '>>> 0' for 'addition modulo 2^32')
        H[0] = (H[0]+a) >>> 0;
        H[1] = (H[1]+b) >>> 0;
        H[2] = (H[2]+c) >>> 0;
        H[3] = (H[3]+d) >>> 0;
        H[4] = (H[4]+e) >>> 0;
        H[5] = (H[5]+f) >>> 0;
        H[6] = (H[6]+g) >>> 0;
        H[7] = (H[7]+h) >>> 0;
    }

    // convert H0..H7 to hex strings (with leading zeros)
    for (let h=0; h<H.length; h++) H[h] = ('00000000'+H[h].toString(16)).slice(-8);

    // concatenate H0..H7, with separator if required
    let separator = opt.outFormat=='hex-w' ? ' ' : '';

    return H.join(separator);
};


/**
 * Rotates right (circular right shift) value x by n positions [§3.2.4].
 * @private
 */
Sha256.ROTR = function(n, x) {
    return (x >>> n) | (x << (32-n));
};

/**
 * Logical functions [§4.1.2].
 * @private
 */
Sha256.Σ0  = function(x) { return Sha256.ROTR(2,  x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x); };
Sha256.Σ1  = function(x) { return Sha256.ROTR(6,  x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x); };
Sha256.σ0  = function(x) { return Sha256.ROTR(7,  x) ^ Sha256.ROTR(18, x) ^ (x>>>3);  };
Sha256.σ1  = function(x) { return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x>>>10); };
Sha256.Ch  = function(x, y, z) { return (x & y) ^ (~x & z); };          // 'choice'
Sha256.Maj = function(x, y, z) { return (x & y) ^ (x & z) ^ (y & z); }; // 'majority'


/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */


/**
 * Encodes multi-byte string to utf8 - monsur.hossa.in/2012/07/20/utf-8-in-javascript.html
 */
Sha256.utf8Encode = function(str) {
    return unescape(encodeURIComponent(str));
};


/**
 * Converts a string of a sequence of hex numbers to a string of characters (eg '616263' => 'abc').
 */
Sha256.hexBytesToString = function(hexStr) {
    hexStr = hexStr.replace(' ', ''); // allow space-separated groups
    let str = '';
    for (let i=0; i<hexStr.length; i+=2) {
        str += String.fromCharCode(parseInt(hexStr.slice(i, i+2), 16));
    }
    return str;
};

function sha256 (string) {
    return Sha256.hash(string);
}